What I have been finding out about Homeschool transcripts is that they are just a record of the classes that a high school student has taken. The record should be short, no more than two pages. It also includes credits and grade points earned.
If you are not part of a virtual or satellite school you will need a list of classes. I found a list of high school requirements for the State of Washington by visiting the states public education website.
My transcript should be similar to the states requirements. I can require more but usually not less. I see that the state requires a minimum of 19 credits to graduate. I also noted that in 2013 an extra credit in math is required.
For each core subject my state lists how many credits are required just to graduate. The site also lists how many credits are required for each subject if you plan to go to college.
Try to find a category that a unique class would fit under. You can get idea from a local college catalog. On the internet you can find a list of electives at Oklahoma Homeschool.
Credits are based on the Carnegie Unit which is a unit of time. According to Wikipedia a Carnegie Unit is 120 hours of class time with an instructor. A credit is given when you meet for 40 minutes five days a week for 36 weeks. You can earn 1/2 a credit per semester.
Each class should have a grade (A, B, C, D, F) earned. Each grade has a number assigned to it. A = 4.00 B = 3.00 C = 2.00 D = 1.00 and F is 0. To find the grade point average for each year, add up the grades and divide by the number of classes. After all of the four years are completed add up all of the classes and divide. The number is the total GPA; write this score at the bottom of the transcript.
You can find free samples of transcripts at HSLDA.There is even a blank transcript that you can download.
I like to think about writing my child's homeschool transcripts when my child is in the 7th or 8th grade. With planning and keeping records writing a transcript should not be hard.